Pump Ops Chpt 5 Flashcards Preview

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Flashcards in Pump Ops Chpt 5 Deck (69)
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1

Below 32 degrees water is converted to a solid state of matter called

Ice

2

For fire protection purposes ordinary fresh water is considered to weigh _____ or _____ a gal

62.4 lb/ft or 8.3lb/gal

3

Water may also used to smother fires in combustible liquids whose specific gravity is higher than ____

1

4

In this manual pressure is defined as _________.

Force per unit area

5

Pressure is easily confused with _______. _________ is a simple measure of weight and is expressed in pounds or kilograms

Force

6

The height required for a 1 square inch column of water to produce 1 psi at its base equals 1 foot divided by ________.

0.434 psi/ft or 2.304 feet

7

Therefore a column of water 2.304 feet high exerts pressure of _______ psi at its base.

1

8

In metrics a cube that is 0.1 m x 0.1 m x 0.1 m x holds _____ liter of water.

1

9

The weight of 1 liter of water is ______ kilogram

1

10

One cubic meter of water holds 1000 liters of water and weighs _________ kg

1000

11

The speed at which a fluids travels through a hose or pipe is determined by the pressure upon the fluid as well as The size of the office through which it is flowing. The speed is often called ______

Velocity

12

Fluid pressure is perpendicular to any surface on which it acts

First principle

13

Fluid pressure at a point in fluid at rest is the same intensity in all directions. This principle is used in hydrostatic testing

Second principle

14

Pressure applied to a confined fluid is transmitted equally in all directions

Third principle

15

The pressure of a liquid in an open vessel is proportional to its depth

Fourth principle

16

The pressure of a liquid in an open vessel is proportional to the density of the liquid

Fifth Principle

17

The pressure of a liquid at the bottom of a vessel is independent of the shape of the vessel.

Sixth principle

18

This pressure is greatest at low altitudes and least at very high altitudes ________ at sea level is 14.7

Atmospheric pressure

19

Any pressure less than atmospheric pressure is called_______, and absolute zero pressure is called a _____.

Vacuum and perfect vacuum

20

In the fire service, _____ refers to the height of a water supply above the discharge orifice

Head

21

To convert head in feet to head pressure, you must divide the number of feet by ______.

2.304

22

The water flow definition of _____ is stored potential energy available to force water through pipes, fittings, hose, and adapters.

Static pressure

23

Is the portion of the total available pressure not used to overcome friction loss or gravity while forcing water through pipes, fittings, hoses, or adapters.

Residual pressure

24

While water is flowing from a discharge opening the forward velocity pressure is considered

Flow pressure

25

Use a pitot tube and gauge to measure the forward velocity of the _______.

Flow pressure

26

Refers to the center line of the pump or the bottom of a static water supply source above or below ground level.

Elevation

27

Is the position of an object in relation to sea level

Altitude

28

When a nozzle is above the level of the pump, there is pressure loss. Conversely when a nozzle is below the pump, there is a pressure gain. The pressure losses or gains due to gravity are called ______.

Elevation pressure

29

Above sea level atmospheric pressure decreases approximately _______ for every 1000 feet.

0.5psi

30

The common term for pressure loss due to friction is

Friction loss